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Exercise 3

Without running the following code, what does it print? Why?

def bar_code_scanner(serial):
    match serial:
        case '123':
            print('Product1')
        case '113':
            print('Product2')
        case '142':
            print('Product3')
        case _:
            print('Product not found!')

bar_code_scanner('113')
bar_code_scanner(142)

Solution

The output is:

Product2
Product not found!

The first call to bar_code_scanner prints Product2 since the first case that matches '113' is the one on line 5. The second call prints Product not found! since the numeric value 142 doesn't match any of the case statements with string arguments. Instead, it matches the _ "default" case.

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